Is there a pin-compatible replacement for FNR3015S3R9MT?

While several parts like YHNR3015-4R7M share the same 3x3mm package and 2-pin layout, none are confirmed as direct pin-to-pin replacements due to parametric differences in inductance and DCR.

What risks should I check before replacing FNR3015S3R9MT?

Key risks include: 1) Inductance change affecting converter stability and ripple, 2) Higher DCR increasing power loss and heat, and 3) Lower current ratings causing overheating or saturation.

FNR3015S3R9MT Alternatives, Datasheet & Cross Reference | Shenzhen CJiang Technology Co., Ltd.

FNR3015S3R9MT is a 3.9µH power inductor in a compact 3x3mm package, ideal for DC-DC converters. Alternatives exist with the same footprint but require review of inductance and DCR.

AI replacement insight

Electrical riskmedium

Inductance and DCR differences require circuit validation.

Package risklow

Top candidates share the same 3x3mm footprint.

Can it be replaced directly?

No direct drop-in replacement is confirmed. YHNR3015-4R7M is a strong form-fit candidate requiring engineering review of its higher inductance and DCR.

Best replacement path

YHNR3015-4R7M offers a similar package and higher current ratings, but has slightly higher inductance and DCR that must be reviewed.

Main risk

Changes in inductance and DC resistance (DCR) can affect DC-DC converter efficiency, ripple, and stability.

Recommended alternatives

A form-fit alternate with superior current ratings but slightly higher inductance and DCR.

View details

Alternative comparison matrix

Feature / factor	FNR3015S3R9MT	YHNR3015-4R7M	YHNR3015-5R6M	Compatibility / risk
Package	3015 (3.0mm x 3.0mm)	3015 (3.0mm x 3.0mm)	3015 (3.0mm x 3.0mm)	3015 (3.0mm x 3.0mm) — Package size matches, enabling form-fit replacement.; YHNR3015-5R6M: Package size matches.
Inductance	3.9 uH	4.7 uH	5.6 uH	4.7 uH / 5.6 uH — Slightly higher inductance may affect converter frequency or ripple.; YHNR3015-5R6M: Significantly higher inductance requires circuit re-evaluation.
Current	1.4 A	2.5 A	2.2 A	2.5 A / 2.2 A — Higher saturation current prevents inductance drop at peak loads.; YHNR3015-5R6M: Higher saturation current is an improvement.
Resistance	137 mΩ	185 mΩ	190 mΩ	185 mΩ / 190 mΩ — Higher DC Resistance (DCR) will increase conduction losses.; YHNR3015-5R6M: Higher DC Resistance (DCR) increases losses.

Application & sourcing insights

Questions & answers

YHNR3015-4R7M is a strong candidate. It has the same 3x3mm package and higher current ratings, but its inductance (4.7µH) and DCR (185mΩ) are higher, requiring review.